18744444815 has 16 divisors (see below), whose sum is σ = 22984321536. Its totient is φ = 14671456800.

The previous prime is 18744444809. The next prime is 18744444827. The reversal of 18744444815 is 51844444781.

It is not a de Polignac number, because 18744444815 - 2⁴ = 18744444799 is a prime.

It is a super-2 number, since 2×18744444815² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155027 + ... + 248036.

It is an arithmetic number, because the mean of its divisors is an integer number (1436520096).

Almost surely, 2^18744444815 is an apocalyptic number.

18744444815 is a deficient number, since it is larger than the sum of its proper divisors (4239876721).

18744444815 is a wasteful number, since it uses less digits than its factorization.

18744444815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403270.

The product of its digits is 2293760, while the sum is 50.

The spelling of 18744444815 in words is "eighteen billion, seven hundred forty-four million, four hundred forty-four thousand, eight hundred fifteen".